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| author | Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> | 2021-11-25 16:38:27 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-12-13 22:33:16 +0100 |
| commit | b2568d6834ea5b05f14bf48ec22a474c291b30f2 (patch) | |
| tree | 92aeccabdfa8c4c527e3639f909b7a7061536852 /Documentation/gpu | |
| parent | Documentation/gpu: Document amdgpu_dm_visual_confirm debugfs entry (diff) | |
| download | linux-b2568d6834ea5b05f14bf48ec22a474c291b30f2.tar.xz linux-b2568d6834ea5b05f14bf48ec22a474c291b30f2.zip | |
Documentation/gpu: Document pipe split visual confirmation
Display core provides a feature that makes it easy for users to debug
Pipe Split. This commit introduces how to use such a debug option.
Reviewed-by: Yann Dirson <ydirson@free.fr>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'Documentation/gpu')
| -rw-r--r-- | Documentation/gpu/amdgpu/display/dc-debug.rst | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/Documentation/gpu/amdgpu/display/dc-debug.rst b/Documentation/gpu/amdgpu/display/dc-debug.rst index 532cbbd64863..6dbd21f7f59e 100644 --- a/Documentation/gpu/amdgpu/display/dc-debug.rst +++ b/Documentation/gpu/amdgpu/display/dc-debug.rst @@ -2,8 +2,18 @@ Display Core Debug tools ======================== -DC Debugfs -========== +DC Visual Confirmation +====================== + +Display core provides a feature named visual confirmation, which is a set of +bars added at the scanout time by the driver to convey some specific +information. In general, you can enable this debug option by using:: + + echo <N> > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +Where `N` is an integer number for some specific scenarios that the developer +wants to enable, you will see some of these debug cases in the following +subsection. Multiple Planes Debug --------------------- @@ -34,3 +44,17 @@ split configuration. * There should **not** be any cursor corruption * Multiple plane **may** be briefly disabled during window transitions or resizing but should come back after the action has finished + +Pipe Split Debug +---------------- + +Sometimes we need to debug if DCN is splitting pipes correctly, and visual +confirmation is also handy for this case. Similar to the MPO case, you can use +the below command to enable visual confirmation:: + + echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm + +In this case, if you have a pipe split, you will see one small red bar at the +bottom of the display covering the entire display width and another bar +covering the second pipe. In other words, you will see a bit high bar in the +second pipe. |